with an electron space having a shape that prevents any electron from moving completely around the cathode or guide electrode; Linear magnetrons

Full Title

Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons (details of transit-time tubes H01J23/00; particle accelerators H05H) > Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field (with travelling wave not moving completely around the electron space H01J25/42; functioning with plural reflection or with reversed cyclotron action H01J25/62, H01J25/64) > with an electron space having a shape that prevents any electron from moving completely around the cathode or guide electrode; Linear magnetrons